Examine source code of Sessionplan

{
  "manifest_version": 2,
  "name": "Sessionplan",
  "version": "1.0.0",
  "description": "Öffnet Sessionplan (sessionplan.de) in einem neuen Tab.",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "browser_action": {
    "default_title": "Sessionplan öffnen"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "dev@timjpeters.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}